package util;


import com.mysql.jdbc.jdbc2.optional.MysqlDataSource;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

public class DBUtils {
    private static volatile MysqlDataSource mysqlDataSource;
//    private static volatile Connection connection;

    private static MysqlDataSource getMysqlDataSource(){
        if (mysqlDataSource==null){
            synchronized (DBUtils.class){
                if (mysqlDataSource==null){
                    mysqlDataSource=new MysqlDataSource();
//                    mysqlDataSource.setURL("jdbc:mysql://127.0.0.1:3306/myblog2022?characterEncoding=utf8&useSSL=true");
                    mysqlDataSource.setURL("jdbc:mysql://43.138.29.187/myblog2022?characterEncoding=utf8&useSSL=false");
                    mysqlDataSource.setUser("root");
                    mysqlDataSource.setPassword("12345678");
                }
            }
        }
        return mysqlDataSource;
    }

    //两种模式（单例模式、多例模式）
    //多例
    public static Connection getConnection() throws SQLException {
        Connection connection=getMysqlDataSource().getConnection();
        return connection;
    }

    //关闭资源
    public static void close(ResultSet resultSet, PreparedStatement statement,Connection connection) throws SQLException {
        if (resultSet!=null) resultSet.close();
        if (statement!=null) statement.close();
        if (connection!=null) connection.close();
    }
}
